heartbreaking

So I went in to have my first US and according to my last period I am supposed to be seven weeks and five days. This is my eighth pregnancy however I only have three children at home because the other 4 were miscarriages.  I took seven home pregnancy test on March 18 which was supposed to be the day I started my period and each one of them showed up positive. So here it is 3 1/2 weeks later and the ultrasound technician is stating that I'm only measuring five weeks. Which is impossible because there's no way seven home pregnancy test picked up a two week pregnancy. So here I am waiting to have my second HGC blood draw tomorrow to find out if my levels have increased. I was so excited and I just don't know what to do...